Processing Build Virtual Raster not opening

[qgib]

Author Name: matteo ghetta (@ghtmtt)
Original Redmine Issue: 16123
Affected QGIS version: 2.18.4
Redmine category:tests_suite

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Trying to add the Build Virtual Raster gdal test, the algorithm works fine (output is correctly generated).
But, when trying to right click in the Processing -> History menu in order to add the test in the yaml file, this error appears:

AttributeError: 'NoneType' object has no attribute 'ReadAsArray'
Traceback (most recent call last):
File "/home/matteo/lavori/QGIS/build-qgis3/output/python/plugins/processing/gui/HistoryDialog.py", line 129, in createTest
TestTools.createTest(item.entry.text)
File "/home/matteo/lavori/QGIS/build-qgis3/output/python/plugins/processing/gui/TestTools.py", line 256, in createTest
dataArray = nan_to_num(dataset.ReadAsArray(0))
AttributeError: 'NoneType' object has no attribute 'ReadAsArray'

[qgib]

Author Name: Giovanni Manghi (@gioman)

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On 2.18.4 the error is different (in both cases also Windows is affected)

Traceback (most recent call last):
File "/usr/share/qgis/python/plugins/processing/gui/HistoryDialog.py", line 129, in createTest
TestTools.createTest(item.entry.text)
File "/usr/share/qgis/python/plugins/processing/gui/TestTools.py", line 234, in createTest
dataset = gdal.Open(token, GA_ReadOnly)
File "/usr/lib/python2.7/dist-packages/osgeo/gdal.py", line 2939, in Open
return _gdal.Open(*args)
RuntimeError: not a string

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• version was changed from master to 2.18.4
• fixed_version_id was configured as Version 2.18

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• priority_id was changed from High to Normal

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• regression was configured as 0
• easy_fix was configured as 0

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Applied in changeset 60a87e9.

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• done_ratio was changed from 0 to 100
• status_id was changed from Open to Closed